What do you think this is?

[t-tree]

This isn't a recent find but one that i labelled two Cyclus but going back to it i don't think the other fossil is one. The nodule came from a Derbyshire , UK opencast that has now been reclaimed . It was a very productive site with a good spread of flora and fauna. 

 

 

 

 

Thank-you for looking John

 

[t-tree]

Sorry i have edited this topic and put gaps between the pics so you can enlarge them now  any ideas on what it is welcome .

 

Cheers John

[caldigger]

The little diddy on the right looks a lot like a small crab to me ( Not saying that's what it is ),  no ideas on the other item.

[t-tree]

5 minutes ago, caldigger said:

The little diddy on the right looks a lot like a small crab to me ( Not saying that's what it is ),  no ideas on the other item.

 

The small roundish one is a Cyclus the unknown one i think could be fauna or flora i'm not sure .

 

Thank- you for your reply John

[piranha]

Ventral cephalothorax of a trigonotarbid.  This paper has some similar examples:

 

Jones, F.M., Dunlop, J.A., Friedman, M., Garwood, R.J., 2014.

Trigonotarbus johnsoni Pocock, 1911, revealed by X-ray computed tomography, with a cladistic analysis of the extinct trigonotarbid arachnids.

Zoological Journal of the Linnean Society, 172(1):49-70  PDF LINK

 

[piranha]

Apparently, I misunderstood the original description by inadvertently reading that this was not a Cyclus.

In any event, Cyclus radialis also matches these morphological features.  Apologies for the mix-up!

 

 

Feldmann, R.M., Schweitzer, C.E. 2019

The enigmatic Cyclida (Pancrustacea): morphological terminology and family-level classification.

The Journal of Crustacean Biology, 39(5):617-633